018  
FXUS65 KBYZ 302124  
AFDBYZ  
 
AREA FORECAST DISCUSSION  
NATIONAL WEATHER SERVICE BILLINGS MT  
224 PM MST MON NOV 30 2020  
   
DISCUSSION
 
 
TONIGHT THROUGH WEDNESDAY NIGHT...  
 
WINDS AROUND LIVINGSTON HAVE PEAKED AS HIGH AS 57 MPH LATE THIS  
MORNING, HOWEVER THE PRESSURE GRAIDENT SHOULD BE BACKING OFF SOME  
THIS AFTERNOON. THIS WILL BE IN RESPONSE TO A SPLITTING SHORTWAVE  
THAT IS STARTING TO MOVE INTO THE WESTERN PART OF THE STATE THIS  
AFTERNOON. THIS WILL BRING A FEW INCHES OF SNOW TO THE MOUNTAINS  
AND SOME LIGHT ACCUMULATIONS TO THE WESTERN ZONES. TOWARDS  
MIDNIGHT AS THE PRESSURE GRADIENT BECOMES MORE EAST/WEST, THE AREA  
AROUND HARLOWTON COULD SEE WIND GUSTS TO AROUND 50 MPH. AS A 700  
MBAR JET START TO WORK IN BEHIND THE WAVE, GUSTY WINDS WILL  
DEVELOP ACROSS THE AREA TOMORROW. EXPECTING WINDSPREAD GUSTS OF 30  
TO 40 MPH.  
 
THE NORTHERN SPLIT IN THE FLOW WILL MOVE LONG THE  
MONTANA/DAKOTAS STATELINE TOMORROW EVENING AND OVERNIGHT WHICH  
WILL BRING ANOTHER SHOT FOR SOME LIGHT SNOW MAINLY IN SOUTHEASTERN  
MONTANA AND DOWN INTO SHERIDAN COUNTY. AMOUNTS STILL GENERALLY  
LOOK LIGHT. WENDESDAY SHOULD BE MUCH CLOSER NORMAL, BUT COOLER  
THAN WE HAVE BEEN, WITH HIGHS IN THE 30S. REIMER  
 
THURSDAY THROUGH MONDAY...  
 
A REX BLOCK PATTERN LOOKS TO DEVELOP OVER WESTERN NORTH AMERICA  
EARLY THURSDAY AND PERSIST INTO MONDAY WITH AN UPPER HIGH OVER  
THE PACIFIC NORTHWEST AND AN UPPER LOW OVER THE SOUTHWEST-SOUTH  
CENTRAL US. THIS BLOCKING PATTERN MEANS THAT THE WEATHER WILL  
CHANGE LITTLE IF ANY FROM THURSDAY THROUGH MONDAY. THIS STEADY  
PATTERN WILL GIVE OUR REGION DRY AND MILD CONDITIONS THROUGH THE  
PERIOD. IT WILL BE BREEZY AT TIMES, ESPECIALLY ON FRIDAY AS A WEAK  
COLD FRONT MOVES THROUGH THE AREA.  
 
HIGH TEMPERATURES WILL BE ABOVE NORMAL THROUGH THE PERIOD...IN  
THE 40S THURSDAY, AND 40S TO LOWER 50S FRIDAY THROUGH MONDAY. RMS  
 

 
   
AVIATION
 
 
VFR CONDITIONS WILL PREVAIL MUCH OF TONIGHT. WINDS GUSTING TO  
45KTS CAN BE EXPECTED ALONG THE WESTERN FOOTHILLS (KLVM, K3HT,  
K6S0) THIS EVENING, WITH GUSTS TO 25 KTS AS FAR EAST AS KBIL. LLWS  
IS EXPECTED OVER THE REGION TONIGHT. A FEW LIGHT SNOW SHOWERS  
WILL DEVELOP THIS EVENING OVER WESTERN MOUNTAINS AND FOOTHILLS,  
CREATING OCCASIONAL MOUNTAIN OBSCURATION INTO TUESDAY. A COLD  
FRONT WILL CROSS THE REGION OVERNIGHT INTO TUESDAY AND BRING SNOW  
SHOWERS TO THE LOWER ELEVATIONS AND A SHIFT TO NORTHWESTERLY  
WINDS. MVFR CONDITIONS ARE POSSIBLE LATE TONIGHT INTO TUESDAY OVER  
SOUTH CENTRAL MT AND NORTH CENTRAL WY. CHAMBERS/RMS  
 

 
   
PRELIMINARY POINT TEMP/POPS
 
 
TUE WED THU FRI SAT SUN MON  
-----------------------------------------------------------  
BIL 033/040 022/035 020/044 027/049 027/050 028/051 028/050  
12/S 00/U 00/U 00/U 00/U 00/U 00/U  
LVM 029/036 018/037 017/045 022/048 025/051 027/051 026/048  
31/N 00/U 00/U 00/U 00/U 00/U 00/U  
HDN 030/041 019/035 014/045 019/050 020/050 021/051 022/050  
13/S 11/B 00/U 00/U 00/U 00/U 00/U  
MLS 029/038 020/032 015/041 020/045 021/045 021/046 024/045  
02/S 10/B 00/U 00/U 00/U 00/U 00/U  
4BQ 027/037 020/030 014/042 022/049 023/048 023/049 024/048  
12/S 21/B 00/U 00/U 00/U 00/U 00/U  
BHK 026/035 017/030 014/039 020/044 021/044 021/045 022/043  
02/S 20/B 00/U 00/U 00/U 00/U 00/U  
SHR 026/037 016/032 011/045 018/050 020/051 022/052 022/050  
35/S 12/S 00/U 00/U 00/U 00/U 00/U  
 

 
   
BYZ WATCHES/WARNINGS/ADVISORIES
 
 
MT...NONE.  
WY...NONE.  
 

 
 

 
 
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